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I like the quad tip look and want to hear more boxer rumble which is totally absent from the 2010 sedan. I know the black diffuser would have to be cut/modified to fit the wider quad tips but besides that will it just bolt right on??

You do know the 2011 WRX sedan also has the quad exhaust also, right? Or is the STI the SPT exhaust? Whichever, the 2011 has a nice rumble. This is the first stock car I've actually liked the exhaust note on.

i have wandered about the same thing, the mufflers look pretty much the same with couple of more holes in them, hence the louder exhaust note. if you look at turboxs website, they say that they are working on exhaust that fits 09-11 wrx/sti sedan exhaust with quad tips, so im assuming the stock one will just bolt on right away with diffuser modification of course.

Got one and it does bolt right up but the tips don't fit the cut outs....gonna have to do a little custom fab work to the bumper. On the other hand, sounds pretty funny with no mufflers. By funny I mean awesome.

I would say test fit, and then if modification is necessary, then begin measuring off, I would say snip it off for cleaner cuts. I would imagine modification would be necessary seeing as how the exhaust cutouts are smaller on the 08-10's.

From what I saw the shop do it was minor cutting to fit the tips under the OEM "diffuser." My guess is my DP forces me to use the Grimspeed adapter which in turns, pushes the system back some, maybe an 1"

LOVE IT!!! It may be a bit of a stretch but with my DP it sounds like a G35 w/ a slight rumble. Someone told me after a couple of thousand miles, the canisters open up a bit to allow more rumble. Hope that's the case